Half-integer thermal quantum Hall conductance has recently been reported for the two-dimensional honeycomb material α-RuCl3. We found that the half-integer thermal Hall plateau appears even for a magnetic field with no out-of-plane components. The measured field-angular variation of the quantized thermal Hall conductance has the same sign structure as the topological Chern number of the pure Kitaev spin liquid. This observation suggests that the non-Abelian topological order associated with fractionalization of the local magnetic moments persists even in the presence of non-Kitaev interactions in α-RuCl3.
Title：Half-integer quantized anomalous thermal Hall effect in the Kitaev material candidate α-RuCl3（キタエフ候補物質α-RuCl3における半整数量子化異常熱ホール効果）
Author：T. Yokoi†, S. Ma†, Y. Kasahara*, S. Kasahara, T. Shibauchi, N. Kurita, H. Tanaka, J. Nasu, Y. Motome, C. Hickey, S. Trebst, and Y. Matsuda*（†：equal contribution、*：責任著者）